For those fights you obviously had time to prearrange your characters so when they ran they spread out evenly? Thats what I have done in the past.... although some method of doing that on the fly would be pretty great.

You use 3 locks 1 mage and 1 priest, right?

How is it for PvP? I would assume 4 locks 1 priest would be pretty amazing with the 4 pets.... but I certainly could see the benefit of the mage (water, ports, more aoe, etc).